Nelson Mandela | 2007

Nelson Mandela celebrates his 89th birthday flanked by former President Jimmy Carter, right, and former United Nations chief Kofi Annan, during the launching ceremony of the group known as the Elders -- a brain trust of elder statesmen -- on July 18, 2007.

Nelson Mandela celebrates his 89th birthday flanked by former President Jimmy Carter, right, and former United Nations chief Kofi Annan, during the launching ceremony of the group known as the Elders -- a brain trust of elder statesmen -- on July 18, 2007. (Alexander Joe / AFP/Getty Images)

Nelson Mandela celebrates his 89th birthday flanked by former President Jimmy Carter, right, and former United Nations chief Kofi Annan, during the launching ceremony of the group known as the Elders -- a brain trust of elder statesmen -- on July 18, 2007.Alexander Joe / AFP/Getty Images